gui: spec-blind suite; search finds the best match, axis ticks never overflow

tests/spec_gui.rs (31 spec-blind tests): exact money text round-trips,
file names never escape the folder or hit a Windows device name, history
against a browser model, fuzzy search against a subsequence model, axis
ticks, the view model against ledger-core, and the attention list.

Found and fixed:
- fuzzy matched greedily, so "ac c" scored 1 for "c" (the "c" inside
  "ac") instead of 5 for the word "c"; it now scores the best alignment.
- ticks accumulated float error (a last tick at -5.55e-17 for a top of
  0), gave more than n + 2 ticks at large magnitudes with tiny spans,
  and overflowed for spans near f64's limit. Ticks are now whole
  multiples of the step, checked, with [lo, hi] when f64 has no nice step.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GWVo7x3UHw5kwCUaWxiejX

crates/ledger-gui/src/lib.rs

@@ -4,16 +4,16 @@
 #![allow(missing_docs)]
 
 pub mod app;
-mod attention;
+pub mod attention;
 pub mod books;
-mod charts;
+pub mod charts;
 pub mod data;
 pub mod demo;
-mod export;
-mod fmt;
+pub mod export;
+pub mod fmt;
 pub mod nav;
 pub mod pages;
-mod palette;
+pub mod palette;
 mod receipts;
 mod theme;
 mod widgets;